Rocker arm bearing



RocKER ARM BEARING l Filed Feb. 2o, 1959 2 sheets-sheet 1 a'i 6 26 34.??5 l/ /l l 2,4 4 fz, l um? l 5. L/' l L/ e f zg al' 2S f4 v 32 Jan., 7,1941., R. W. DARDEN .2,228,003

v, RocKER ARM BEARING Filed Feb. 20, 1939 2 sheetsl-sheet '2 \6` 28:3/30,' Z8 35j? fz ZlfD' @27,

Patented Jan. 7, 1941 'i UNITED STATES PATENT GDFICEv ROCKER ARM BEARINGRobert Webster Darden, Tyler, Tex. Application February 20, 1939, SerialN o. 257,554 4 Claims. (Cl. 308-21) This invention relates toimprovements in nection between the walking beam operator and rocker armbearings, particularly intended for the pull link line; use inconnection with oil well pump jacks. Figure 8 is a vertical cross:sectional view taken The primary object of this invention is to proonline 8-8 of Figure '7, looking -in the direction vide a rocker armbearing comprising comple- 0f the arrows further illustratingthevconnection 5 mentary arc surfaces forming a fulcrum for the betweenthe walking beam operator and pull line, Awalking beam of a pump jack,whereby vibraand tionwill be reduced and a more direct pull force Figure9 is a cross sectional View similar to Figmay be directed to the pumprod of the well. ure 8 and taker! at right angles thereto.

vA further object of this invention is to provide In the drawings,wherein for4 the purpose of l0 a bearing of the above mentionedcharacter which illustrating the invention and wherein like refwi11reduce friction between the fulcrum parts erenoe Characters will beemployed to designate and will require a minimum amount of attentionlike parte throughout the Seme, the reference from the well operator.character 5 will generally be employed to desig- A stiii further objectof this invention is to nate a pump ieck commonly employed in well l5provide a rocker arm bearing of the above menpumping Operations andincludes Side frame bese tioned character in which the walking beam orangle bars 6 which may be anchored to a Concrete rocker arm is caused toshift from one side to base I or other suitable suppOri- The pump theother of the fulcrum point, thereby increasing frame structure alsoincludes a pair of vertical the force of puii during the extrememovements angular members e connected at the top by means of the walkingbeam. of a horizontal frame member 9 riveted or welded A still furtherobject of this invention is to thereto a5 el? |0- A breCe befr ilmeylleve iiS provide ua, walking beam or rocker arm bearing endsconnected to one side of the horizontal bar of the above mentionedcharacter whereby the 9 While the other end is connected to the oppositefulcrum bearings produce a rolling action along end of the base barframe member 6. 25

' their curved contacting faces, considerably re- The abOVe COHSiiueS aframe fOr e pump .lack ducing frictionai wear and eliminating costly forsupporting the walking beam l2'fu1orumed repairs. as at I3 to the toprail 9, and having ron one Other objects and advantages of the inventionend, a SeCiOr-Shaped SheeVe i4 t0 Which 011e eufl will become apparentduring thefeourse of the of the pump Cable l5 is secured. Extending 3following description taken with the drawings, downwardly and connectedto the Walking beam wherein, I2 is an operating lever I5 braced by meansof a Figure l is a top elevational view of a, pump jack Vbar I'I havingone end connected to the walking embodying this invention, illustratinga section beam l2 and the opposite end Connected to the broken awayadjacent the fulcrum point of the Operating lever' |5 35 walking beam;The pump cable I5 extends downwardly through Figure 2 is a sideelevational view illustrating a Well Casing guide I3 aud may beConnected t0 the pump jack and showing the manner in which thesector-shaped sheave Ill by means of a suitthe rocker rarm and pull linefulcrums are assoable clevis so that the pump cable will follow avciated therewith. straight line path during its vertical reciproca- 0Figure 3 is a fragmentary View of the Walking tion. To reinforce thesector-shaped sheave, a

beam fulcrum illustrating in detail the rocking lomcqbm' 20 is provdedIh? Walking beam I2 Surfaces thereof; is oscillatedby kmeans of ahorizontal pull link 2l Figure 4 is a vertical cross sectional view ofthe connected to a donley engme as at 22 and ful' Walking beam* imc mtaken on une 4 a of crumed to the walking beam operator arm I6 at t theosi en Figure 2, looking 1n the direction of the arrows; Tggpinventioalso includes a Walking -beam Figure 5 is a vertical cross sectionalview taken fulcrum Comprising a Segment shaped block 23 on llne 5-5 ofifleure if lookmg in the dlreton bolted to the top mn a of the pump jackframe 0f the arrOWS Illustralmg the retaining guide as at 24 and it isto be understood that a pair member fOr the fulerum rOCker; of framesare provided in spaced relation so that Figure 6 is a fragmentary sideelevational view the walking beam I2 may oscillate thereof the pull linefulcrum connection with the walkbetween. Also, that there will beprovided lng beam operating arm; a fulcrum block 23 on each top rail 9.Each Figure 7 is a top elevational View 0f the confulcrum block 23includes a relatively straight 55 vertical wall 25 terminating in adownwardly inclined arcuately curved surface 23. A recess 21 is formedon the inner wall of each segmentshaped fulcrum block for receiving aguide member carried by the walking beam supporting rocker which will behereinafter more fully described.

Mounted on opposite sides of the web portion of the Walking beam l2 arelaterally extending arms 28, the inner ends of which are provided withbase plates 3D anchored in place by rivets or nuts and bolts 3|. Securedto the free end of each laterally extending supporting arm are rockerbearings 32 having a` bearing facer 33 corresponding to the arcuatelycurved surface 26 of the fulcrum block 23 and adapted to vrock thereonduring the oscillation of the Walking beam I2. The upper face of therockerfbearing is similarly shaped as at A34. Extending down-- wardlyfrom each rocker bearing is an arm 35 having a curved edge 36 of asmaller circumference than the recess 21 to allow an oscillatingmovement of the arm 35 therein and being operative lin conjunction withthe bearing .block 23 to prevent lateral movements of the rockers 32.Formed on the arm 35 and extending laterally therefrom is a lug 31adapted to extend out of the pocket 21 and under a guide segment 38which .is arcuately curved and is fastened at both ends to thesector-shaped block 23, as at 33 whereby displacement of the guide arm35 will be prevented should the walking arm be bucked when the pumpcable becomes stuck or entangled.

The fulcrum connecting the pull link line to the walking beamoperatingarm I6 comprises a pair of spaced bearing blocks 46 connected by a basemember 4l anchored to the flange of the operating arm I6 as at 42, bymeans'of bolts or rivets. Curved bearing surfaces 43 are formed on thespaced bearing blocks 46. Formed on the inner wall -of the spacedbearing blocks 40 are fulcrum pockets 44 adapted to receive fulcrumextensions 45 formed on the complementary bearing rockers 46.

Each complementary bearing rocker 46 is provided with a curved bearingsurface 41 adapted to rock on the curved bearing surface 43 of thebearing blocks 40, and said bearing rockers are held in spaced relationby means of a connecting web 48. If desired, bearing faces 49 may besecured to the fulcrum arms 4'5 and in order to hold the bearing arms inplace, a bolt 56 may extend through an angular slot 5| formed thereinand through the spaced bearing blocks 46, as at l52. A .nut 53 isthreaded on one end of the bolt 5.6 thereby preventing displacementthereof.

It will be noted that the .pull links 2-I are each provided with afan-,shaped end 54 for connection with the bearing rocker 46 and said.connection includes oppositely-extending connecting pins 55 `passingthrough suitable openings in the fanshaped ends 54 held againstdisplacement by cotter pins or keys 56. Anchoring pins 51 also extendthrough the fan-shaped ends -54 and through the bearing rocker 46 toprevent a pivotal motion between the end of the pull link 2i yand therocker bearing 46.

It is to be understood that theform ,of the invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes in the shape, size and arrangement of parts may be madewithout departing from the spirit of the invention or the scope of thesubjoined claims.

I claim:

1. A rocker bearing comprising a stationary rocker bearing block havinga curved bearing face, amovable rocker bearing member having anoppositely curved bearing face adapted to rock on the first mentionedcurved bearing face, the tangent to said bearing faces at the normalpoints of contact being positioned at an angle approximating 45 to theVertical, operating means for the movable rocker bearing member andmeans rigidly connected to the movable rocker bearing member vandlaterally freely engaged with the stationary rocker bearing block toprevent lateral displacement of the movable rocker bearing member.

2. A rocker bearing comprising a stationary bearing block having acurved bearing surface, a movable rocker bearing having an oppositelycurved bearing surface adapted to rock on the bearing surface of thestationary bearing block, said curved faces being the outside arcs ofcircles, the tangent to said arcs at the normal points of contact beingpositioned at an angle approximating 45 tothe vertical, operating meansfor the movable rocker bearing, and an extension formed on .the innerside of the movable rocker bearing block adapted to be received in apocketformed in the inner side of the stationary bearing block toprevent lateral displacement of the movable rocker bearing.

3. A rocker bearing comprising a stationary Vbearing block having acurved bearing surface and a recess at the inner side extending inwardlyfrom the bearing surface, a movable bearing block ,having a cooperatingcurved bearing surface for rolling contact with the stationary bearingblock,

`operating means for the movable bearing block movable ina substantiallyhorizontal plane and an extension formed on the inner side of themovable bearing block seated in said recess to prevent lateral movementof the movable bearing block.

4. A rocker bearing for pump jacks having a Walking beam and a support,comprising a stationary bearing member having a curved bearing facemounted on the support, a movable bearing rocker carried by the walkingbeam and `having a curved face adapted to roll on the stationaryvbearing member, said curved faces being the out-

